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A268028
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Number of 4Xn 0..2 arrays with every repeated value in every row greater than or equal to, and in every column greater than, the previous repeated value.
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1
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63, 3969, 250047, 13530274, 687233742, 32747526923, 1486191908610, 64725260937166, 2722665554883854, 111163751115106132, 4422667685678114786, 172002220213857351197, 6556076286013521999466, 245446300682062937711088
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OFFSET
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1,1
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COMMENTS
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LINKS
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EXAMPLE
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Some solutions for n=2
..1..1....2..1....1..1....0..0....2..1....2..2....1..0....2..1....0..0....1..2
..2..0....2..1....2..2....2..2....1..2....0..1....0..0....1..0....0..0....2..1
..1..1....0..2....2..1....0..1....2..0....1..2....1..1....0..2....2..1....2..2
..1..1....2..2....1..1....0..0....2..1....2..0....1..0....1..0....1..0....1..1
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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